/Engine/Source/Runtime/Slate/Public/Framework/Views/TableViewMetadata.h
Returns all currently constructed rows that represent selected items
virtual [TArray](API\Runtime\Core\Containers\TArray)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [ITableRow](API\Runtime\Slate\Widgets\Views\ITableRow) > > GatherSelectedRows() const